Burner.



E. cAHow.v

BURNER.

APPLICATION FILED JUNE I4, I9I8I Patented Jan. 14, 1919.

III-IIII III I l rl/ Z' T I 46 zen of the United States,

UNITED STATES PA NT OFFICE.

ERVIN oAHow, or TAMPA, FLORIDA.

BURNER.

Specification of Letters Patent.

Patented' aan. 14, 1919.

Original application lenl May 2, 1917, Serial No. 165,824. Divided and this application led June 14, 1918. Serial No. 240,093.

To all whom t may concern:

Be it known that I, ERVIN CAI-row, a citiand residing at Tampa, in the county of Hillsborough and State of Florida, have invented a new and Improved Burner, of which the following isV a specification.

This application is a division of my application for patent on liquid heater, S. N. 165,824, filed May 2, 1917.

In the construction of water heaters for domestic use it is customary to locate the gas burner at the bottom of the chamber in which the helical water pipe is placed. The hot portion of the flame is therefore in contact with but a short length of pipe, and as the gas cools very quickly after leaving the burner the greater portion of the coil is of comparatively little value thus resulting inv a large loss of heat.

To the end of overcoming the objection stated and obtaining a greater efficiency than has been possible heretofore, the present invention consists in a helical burner which, when applied to a helical water coil of the same pitch, uniformly directs a flame against the latter throughout the length of the heating surface. It further consists in a burner of the character described having means for conducting gas thereto at a plurality of points, whereby a substantially uniform gas pressure is maintained and whereby the burner is properly braced.

The invention also consists in certain means for supporting the helical burner whereby the latter may be adjusted'vertically and whereby it is prevented from swinging angularly about its axis. The inf vention also resides in adjustable means for shifting the burner up and down and for simultaneously varying the supply of gas admitted thereto. Agam, it consists in a vertically adjustable burner together with a valve for supplying gas thereto, and means for adjusting the supply-of gas for a given position of the burner. It also consists in a valve casing having a tubular upper end portion, and a burner seat conforming there? to and slidable up and down thereon, and a gas controlling valve for actuating the burner seat. The invention further consists in means, carried by the adjustable burner seat, for varying the mixture of gas and air. The invention also consists in certain details of construction shown, described and claimed.

In the drawings, Figure 1 is a vertical secinvention and Fig. 2 is a horizontal section corresponding thereto and taken above the coil. Fig. 3 is a plan view of the'burner. Fig.'4 is an elevation of the gas valve and associated elements, the valve being open. Fig. 5 is an enlarged view looking from the left in Fig. 4, parts being broken away; Fig. 6 is a horizontal section through the vvalve and casing. Fig. 7 is a vsection on the line 77 of Fig. 5. Fig. 8 is a vertical section through the coil and burner pipe.

The details of the casing may be varied between wide limits, and need not here be described.. The helical water coil, while also subject to variation, is preferably formed of the three helical tubes v18, arranged in reference to one another substantially in the manner shown, and provided at top and bottom with headers formed of threaded fittings 15 and 16, that communicate with exterior pipes, not shown, through the nipples 12.

Arranged longitudinally of and centrally below the coil for substantially the whole length of the latter on a helix line of substantially the same pitch'is a burner tube 19 having at intervals fine orifices 20 through which gas is directed upwardly Ainto the space or longitudinal pocket formed by the three water tubes. In this manner there is secured both a much larger heating surface than is ordinarily obtained and a better application of the heat, resulting in a greatly increased eficiency. The heatedproducts of combustion tend to follow the coil. Gas is delivered to the lower end portion of the burner pipe through a curved pipe section 2l (which, as shown, is simply a bent end of the burner pipe). Gas is also preferably, while not necessarily, supplied to an intermediate portion of the burner pipeby a pipe 23 which has an additional function of bracing the burner.

The section 21 is received in and preferably brazed to the opening in the side of the tubular burner seat 26 that lits closely to and is slidable vertically on the reduced upper end 28 of the tubular valve casing 29, whereas the pipe 23 preferably enters said burner seat through an opening inthe top as best shown in Fig. 5. Extending crosswise of the casing is a tapering valve 30 of means of the nut 36 and washer 38 constitutes means for turning the valve. A cam 39 which is mounted on a round portion 39 and held in any desired angular relation in respect thereto by a set screw 39 is arranged to engage a projection 40 on the burner seat. The upper end of` the valve casing has slots 42 in longitudinal alinement with slots 43 in the burner seat, the slots 43 preferably being longer than the slots 42 and extending down below the latter when the burner seat is in its lowermost position,

that is, when it rests on the shoulder 46, as

shown in Fig. 5. Apin 48 projects from the reduced end of the valve casing and is received in a longitudinal slot 49 cut in the burner seat whereby the latter is prevented from turning about its own axis and a proper positioning of the burner below the coil is insured. A regulating collar 50 may be slid longitudinally of the burner seat to cut off more or less of the slots 43 and thus control the admission of air. The valve casing is threaded at its lower end to receive nuts 51 for holding it in position on the bottom. Air is admitted freely to the burner through holes 52 in the bottom.

In use, the valve casing being connected to any suitable source of gas and the coil being connected to a tank in any desired manner, the valve is turned to partly or entirely open position, that is, toward the full-line position, Fig. 4. The burner seat and burner thereupon lower and the slots 43 increasingly register with the slots 42 thus admitting an added supply 'of air to the burner tube substantially in proportion to the increase in the amount of gas-the actual amount is also determined by the position of the air mixer collar 50 and the angular position of the cam in respect to the valve. Therefore with the increase in the amount of combustible mixture admitted to the burner the latter is removed proportionately farther from the water coil. The heat is consequently applied in an efficient manner at all times, the hottest point of the flame being always close to the surface of the coil.

As stated above, the features whereby the burner is adjusted may in some cases be omitted. The details may also be widely varied in other particulars and the device may be used for purposes other than those to which the ordinary domestic water heater are ordinarily put, for example, for the heating of water for house heating systems and for the generation of steam and for the distillation and separation of liquids. W'hile the coil is preferably curved along the lines of a helix it may of course take other forms. I do not,'therefore, wish to be limited except as indicated by the subjoined claims.

I claim 1. In a device of the class described, a valve casing having a cylindrical upper end, a valve rotatable about an axis transversely of that of said end for controlling the flow of gas through the casing, a' burner seat fitting said end and slidable vertically in respect thereto, a burner carried by the burner seat, means for moving the valve, and means for simultaneously shifting the burner seat up or down.

2'. A burner including a valve tubular easing, a valve, rotatable about an axis at substantially right angles to that of the casing, for regulating the flow of gas through the casing, a burner seat, and cam means where- A by the burner seat is raised or lowered respectively, as the valve is moved in one direction or the other.

3. A burner including a vertically adjustable burner seat, a helical burner pipe leading upwardly therefrom, means for supplying gas to the burner seat, and a pipe other than the burner pipe for conducting gas from the burner seat to a point in the burner pipe considerably removed from said seat.

4. In combination a xed valve casing having a reduced cylindrical upper end, a burner seat slidable along said end, a movable valve for said casing, said burner seat being movable along said end in accordance with the position o-f the valve, a burner carried by the burner seat, and a pin and slot connection whereby the burner is prevented from swinging about the axis of the cylindrical end of the casing.

5. In combination, a fixed fuel pipe having an upwardly extending end, a movable valve carried by said end for controlling the flow of fuel, a burner seat surrounding the end and conforming closely thereto, means for preventing the burner seat from swinging about the axis of the pipe, and means movable with the valve for admitting air to the fuel in the burner seat in proportion to the amount of fuel flowing through the valve.

6. In combination, a fuel pipe having an upwardly projectinor end, a valve carried by said end for controIling the supply of fuel, a burner seatslidable longitudinally in respect to said end, means movable with the valve for causing the burner seat to slide, said burner seat and said pipe being so constructed and yarranged as to form an opening for admitting air to the fuel, the size of the opening varying in accordance with the position of the valve, and means for independently varying the size of the opening.

ERVIN CAHOW.

Copies of this patent may be obtained for ve cents each, by addressing the. Commissioner of Patents.,

Washington, D. G. 

